Piston rod packing



Filed June 26, 1929 2 Sheets-Sheet gwve ntoz FEzmsR/cw D. DURHFIM March 8, 1932. F. D. DURHAM PISTON ROD PACKING Filed June 26, 1929 2 Sheets-Sheet attozue a I Patented Mar, 8, 1932v thatshown in Figure 2.; p 25 Figures 5fand 6 arejdetailsectionalviews sm'nmmgpjmsm or 'LoUIsvInLE, KENTUCKY yirsrou-sonriicxrne V 1, f A l ation filed l'uiie 2e,

' In standard metallic packingsfor'ipiston and like rods, :there :is excessive wear dueto the pressure of the'fluid acting on thepacking rings in directions to force them against the rod thatis packed and against the wallet the v 7 chamber inwhich they are located; Asaconsequence it has'been found that the pressure is so excessive that it is more-thanthe oil filmwillstand. Therefore scoring'of the rod as well .asvundue wearing of the rings takes place f ig 7 J The object of the present invention is to provide a novel structure that will to "a marked degreeovercome thesetendencies and difl'iculties. i In the accompanying drawings J f. Figure 1 isa view in elevation of one embodiment of-the invention. e j 7 1 Figure 2 is a face viewof the ring members.- Figure 3 is a vertical sectional View. onathe line of Figure 2.7 i i z Figure llis, a view of the ofmodified forms'of construction. i a In the embodiment disclosed in Figures 14 inclusive, the rodto be packed'is designated 7 and asusual reciprocatesinaheador gland '8. provided with a socket 9 ll'lgWhlCh the packing is housed. A cap or faceplate 10 covers the openend ofthefsocket and is held in place by the usual bolts 11. I 3 I Located in the sockets 9 arev cups12which ,may be termed casing; members, these memhers 12 having bores 13 of slightly greater diameter than the diameter of thejr'od 7 that passes through said bores. Each member 12 is provided with. a-chamber 14 thatopens;

21 and the ring 25 to bear against the flared -wall 19 ot the chamber extension, sealing the 90 through one end of the member, the open end being closed by the back ofthe adjacent member'12. As a consequence the chamber, 14 has end walls15fand 16 and a peripherial wall 17., The rear end'wall' 16has in its im her-portion a chamber extension 18 provided with a flared peripheral'wall 19;

In the various chambers 14;,are located packingring members. Pe'rferably two packing rings are employed, designated respectively 20 and 21. .The packing ring 20 is vof sectional formationwith radial cuts22. e, The

"reverse, face to 1929'. Seria1 No, 373,801. V I packing =ring-21 'is provid-ed with diagonal cuts indicated at 23, which are staggered with relation tothe cuts 22 of the. ring20, thereby providing an effective seal By referring to Figure 1 it will be noted that theipack-.

ing ring 20 bears against :thechamber wall 15, while the packingring 21 bearingagainst otherchamber wall 16. 'Ii'f'no other provision is made, fluid travelling along the rod? would; 30 press-against,thepacking ring 21, and urge it and the ring:20fifirmly against the chamber wall 15. Gonsequentlyithe vibration'of the rod will and often does cause excessive wear on therings: More than that,- this fluid op-=05 To prevent this, an expansible ring member 7 is omployed comprising an inner, ring 24: and

anoutervring 25. The outer ring 25 islocated in the chamber l l and occupiesthe space between thechamber wall 16 and the ring 21, bearingagainst the side'of the latter. '35 It is furthermore provided with a flange 26 entering the extension '18, of the chamber 7 and having an outer tapered wall that be'ars' against the flared wall 19'of said extension.

ithin the ring 25 isthe ring- 21 outwardly flanged as shown at 27, thelouter edge of said flange corresponding fin: shape to the said flaredwall 19.1 It will be noted byreference to Figurel that, the internal diameter of the ring 24 is'greater than the diameter of the rod 7. Consequentlyfluid under pressure findingv its way along the rod 7, will enterv said ring and {expand it; This causes said ring chamber 11- from the intake of the fluid under pressure and at the'same time urging the rings 21 and 25 toward the rings 21. and

20 and securing the necesssary packing bearprovided, but the objectionable featuresiof the standard packingare overcome.

the side of the" ring 20' is spaced ifr'om the' ingbut avoiding excessive pressure; -The consequence is that a properly packedrod is her is designated 12a and is chambered as shown at 14a. The two packing rings are designated 20a and 21a. The extension of the chamber is illustrated at 18a. The two sealing rings are designated 24a and 25a. In this form of structure it is to be noted that the outer wall of the extension chamber 18a is not flared, but the sealing ringfl ta, is spaced from the end wall of the extension chamber so that the fluid under pressure flow- 7 ing into the extension chamber 18acan operate I not only against the internal face of, the Scale ing ring 24a, butagainst the outer end of the same, exerting sutficient pressure to secure the sealing action against the flow of fluid into the main portion of the chamber 14a.

In Figure 6 another-modification is shown. Therein the casingmember is designated 12?) and the chamber 14b. The packing rings are shown at 20b and 21b. The extension of the chamber is illustrated at 18?). A single sealing ring is herein employed designated 24b. It is provided with an outstanding lip or flange 276 that is located in the extension chamber 18b. In this structure the sealing ring Mb will be expanded in the manner already explained and pressure against the end of the flange 27?) will of course urge the sealing ring 24b against the adjacent packing Ting This pressure may be augmented by springs as 196 seated in the end wall of the chamber 146 and operating laterally against the sealing ring 24?).

'From the foregoing, it is thought that the construction, operation and many advantages ofthe herein described invention will be apparent to those skilled inthe art without'further description and it will understood that various changes in the size, shape, proportion and minor details of construction maybe restored to without departing from *the spirit or sacrificing any of the advantages 'of theinvention.

' What/I claim isi V 1. In combination with a rod to be packed, a casing member: surrounding the rod'and chambered, the chamber having side walls and an outer wall, a contractile rodpacking ling member in the chamber surrou riding the rod, bearinga-gainst one of the side walls -and spaeed from the other side wall, and an expansible sealing ring member operatingto press against the latter, said sealing ring bridging the space between said other side wall and packing ring member and having 'an'outer port-ion bearing against the casing member, whereby "fluid leaking along the rod willaccumulate against the sealing ring and force itagainst the packingring, there- -'by' sealing the chamber outside said rings against the said fluid, 7

2. In combination with a rod to be packed, a casingmember surrounding the same and havinga chamber, said chamber having a Mduoed extension at-one end providing :1

peripheral shoulder, a contractile packing ring in the chamber and surrounding the rod, and a sealing ring located in the reduced extension of the chamber and having ing ring and contracting said ring.

- 3. In combination with a rod to be packed,

a casingmember surrounding the same and having a chamber, said chamber having a reduced extension atone end providingu peripheral shoulder, said shoulder being flared toward the chamber, a packing ring in the chamber and surrounding the rod, and a sealing ring located in the reduced extension of the chamber and having a peripheral portion bearing against the shoulder. audv'one end bearing against the packing ring, said sealing ring being spaced from the rod to provide a pressure chamberwithin it to hold fluid under pressure that acts to expand the sealing ring against the shoulder, and said shoulder acting to shove the sealing ring against'the packing ring whereby the chamber aroundthe packing ring is sealed from fluid leaking along the rod and said packing ring is relieved of "fluid pressum-on its periphery. I

4. In combination with a rod to be packed, a casing member surrounding the same and having a chamber, said chamber having spaced end walls and a reduced extension in the innerportion of one of said end walls, a pluralityof coacting contractile packing rings the chamber bearing against the other end wall and surrounding the rod, and

an expansible substantially fluid proof sealing ring member in the extension, said sealing ring entering the chamber proper and bearing against the adjacent packing ring, the sealing ring having an internal diameter greater than the diameter of the rod forming a pressure chamber that receives fluid leaking along said rod whereby pressure thereby accumulated therein, causes the sealing ring to be expanded and pressed against the adjacent, packing ring.

5. In combination with a rod to be packed,

va casing member surrounding the same and having a chamber, said chamber having spaced end walls and a reduced extension in the inner portion of one of said end walls,

said reduced extension having a flared outer wall, aplurality of coacting contractile pack- 8 ing rings in the chamber bearing against the other end wall and surrounding the rod, and an 'expansible sealing ring member in the extension andhaving a tapered portion bearing against the flared wall thereof, said seal? ing ring entering the chamber proper and bearing against the adjacent packing ring, the sealing ring having an internal diameter greater than the diameter of the rod, that receives fluid leaking along said rod wherev by pressure thereb o accumulated therein, causes the sealing ring to be expanded and pressed against the adjacent packing ring."

6. In combination with a rod-to be packed,

a casing member surrounding'the rod and chambered, a contractile rod/packing ring member in the chamber surrounding the rod, a sealing ring member alongside and operating against the contractile rod pack; ing ring and having an outer portion bearing against the casing member, whereby fluid leaking along the rod will accumulate between. said sealing ring and the rod, pro- 9 ducing a vpressure within the sealing ring to expand it 'againstthe casing member, sealing the portion of the chamber around the packing ring against said fluid, and causing; the g sealingring to press against the contractile, packing ring. i In testimony whereof I aflix my signature.

- FREDERICK D. DURHAM. 

